Multiscreens not working in ATC Simulators Posted December 2 · Report reply I had this problem and found the following solution: While working/playing on my computer, I came across Acronis True Image. In addition to its usual backup, I noticed that it was running a programs called " Acronis Active Protection." The pop-up window for this program indicates that it protects against ransomware. Being always suspicious, I turned it off. Lo and behold, I can now open Tower 3d windows without them disappearing.